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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qv4l2filedescriptor_p.h"
#include <QtMultimedia/private/qmultimediautils_p.h>
#include <QtCore/private/qcore_unix_p.h>
QT_BEGIN_NAMESPACE
namespace QtV4L2 {
QV4L2FileDescriptor::QV4L2FileDescriptor(QUniqueFileDescriptorHandle descriptor)
: QUniqueFileDescriptorHandle(std::move(descriptor))
{
Q_ASSERT(isValid());
}
- bool QV4L2FileDescriptor::call(int request, void *arg) const
+ q23::expected<int, std::error_code> QV4L2FileDescriptor::call(int request, void *arg) const
{
- return QtMultimediaPrivate::qt_safe_ioctl(get(), request, arg) >= 0;
+ const int result = QtMultimediaPrivate::qt_safe_ioctl(get(), request, arg);
+ if (result < 0)
+ return q23::unexpected(std::error_code{ errno, std::system_category() });
+
+ return result;
}
- bool QV4L2FileDescriptor::requestBuffers(v4l2_memory memoryType, quint32 &buffersCount) const
+ q23::expected<int, std::error_code> QV4L2FileDescriptor::requestBuffers(v4l2_memory memoryType,
+ uint32_t bufferCount) const
{
v4l2_requestbuffers req = {};
- req.count = buffersCount;
+ req.count = bufferCount;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = memoryType;
- if (!call(VIDIOC_REQBUFS, &req))
- return false;
+ auto callResult = call(VIDIOC_REQBUFS, &req);
+ if (!callResult)
+ return q23::unexpected(callResult.error());
- buffersCount = req.count;
- return true;
+ return int(req.count);
}
-
bool QV4L2FileDescriptor::startStream()
{
int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (!call(VIDIOC_STREAMON, &type))
return false;
m_streamStarted = true;
return true;
}
bool QV4L2FileDescriptor::stopStream()
{
int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- auto result = call(VIDIOC_STREAMOFF, &type);
+ const auto result = call(VIDIOC_STREAMOFF, &type);
m_streamStarted = false;
- return result;
+ return bool(result);
}
} // namespace QtV4L2
QT_END_NAMESPACE